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3.2 Dissipation and efficiency

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Question 1

Two electric turntables are tested while accelerating their platforms. Each turntable dissipates 90 J of energy during its test.

Turntable P has an efficiency of 0.60 and turntable Q has an efficiency of 0.75.

What is the ratio of the useful energy transferred by P to the useful energy transferred by Q?

[1]

$4 : 5$

$2 : 1$

$1 : 2$

$8 : 5$

Markscheme

3.2 Dissipation and efficiency Questions

GCSE
Physics
3.2 Dissipation and efficiency

100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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